Ceiling



FIG. 1 is a perspective view of a ceiling showing my new design. The broken lines are for illustrative purposes only and form no part of the claimed design; and,

FIG. 2 is a perspective view of a second embodiment of a ceiling showing my new design. The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a ceiling, as shown and described. 